The MP for Madang in Papua New Guinea says his complaint against businessman Bryan Kramer alleging a conspiracy to kill is not politically motivated.
Mr Kramer and Nixon Duban both contested the Madang Open seat in 2012, the result of which Mr Kramer disputed, leading to a by-election last year.
Mr Kramer was arrested in Port Moresby on Wednesday after police received a complaint from Mr Duban that Mr Kramer had planned, at some point, to cause his death.
Mr Kramer has denied the allegations, saying his arrest is an attempt to put pressure on him to deter his social media work.
However, Mr Duban has since told the Post Courier newspaper that the arrest has got nothing to do with his status on social media and that people who collaborated with Mr Kramer's plan to kill him have also come forward to the police.
